DETERMINATION OF THIN FILM'S MECHANICAL PROPERTIES

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used for the SEM imaging and SEM/EDS analyses. SJ-301 Mitutoyo surface roughness testerwas used for determination of FeB layers roughness. Test measurement results give; Ravalues of surface which means the differences between maximum and minimum asperitiesheight versus measurement distance. Mechanical and elastic properties (hardness, youngmodulus, yield stress, etc.) of FeB layers were obtained from load-indentation curves by usingultra-micro hardness tester.Finite element simulations are performed for the problem of Vickers indenter brought intocontact against an infinite half space. Both the indenter and half space are modeled as axialsymmetry geometry. While the isotropic hardening has been regarded as an accurate model infinite element modeling of indentation, this assumption is merely a simplification of the truemechanical response of the material as the shape of the yield locus in most metals variesduring plastic flow. M. Mata et al. stated that ‘the hypothesis of isotropic hardening isconsidered to provide accurate results in the analysis of loading histories where no reversedplastic deformation occurs well beyond the yield surface. The response is taken to be rateindependent, so in the quasi-static calculations presented here no rate effects are represented.The influence of large deformation is included in the analysis by using geometry nonlinearityactivated in ABAQUS. The Von Misses yield criterion is taken for the computation.3. Results and Discussion3.1 FeB and Fe 2 B Layer CharacterizationThe XRD pattern of the borided layers, which was formed on SAE 1020 and 1040 qualitysteel at 900 o C for 2, 4 and 6h, are given in figure 3.1 and figure 3.2, respectively. Accordingto this pattern, layer includes only FeB phase with (111), (210), (101) and (111).
140120100SAE 1020 Quality Steel Borided at 900 C2h borided4h borided6h boridedIntensity (%)80604020039 44 49 54 59 64 692 ThetaFigure 3.1 Phase analysis of 1020 steel borided at 900 o C for 2h, 4h, and 6h140120SAE 1040 Quality Steel Borided at 900 C2h borided4h borided6h borided100Intensity (%)80604020039 44 49 54 59 64 692 ThetaFigure 3.2 Phase analysis of 1040 steel borided at 900 o C for 2h, 4h and 6h.
Page 1 and 2: DETERMINATION OF THIN FILM’S MECH
Page 3 and 4: İNCE FİLMLERİN MEKANİK ÖZELLİ
Page 5: • Hardness of the boride layer ca
Page 9 and 10: During boriding, the diffusion and
Page 11 and 12: Table 3.2 Surface roughness measure
Page 13 and 14: 5000045000400001040-2-1601040-4-160
Page 15 and 16: Force (mN)7006506005505004504003503
Page 17 and 18: 6005001020-21020-41020-67006001040-
Page 19 and 20: For 1040-4;F 98,0712H = == 0,0074x1
Page 21 and 22: In this study, the FeB layers were
Page 23 and 24: )Figure 3.12 Magnified view of mode
Page 25 and 26: The load displacement is nearly a s
Page 27 and 28: Kurt E. Peterson and C.R. Guarnieri

DETERMINATION OF THIN FILM'S MECHANICAL PROPERTIES

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